Elliotte Rusty Harold offers this summary:
[T]here's a lot of good new stuff here that will be useful to many users. However, much of it has been bolted on to a framework that was never designed to support anything like it. The result is a confusing mess, with lots of rough edges where the pieces don't join up precisely right, just waiting to trip up the unwary programmer. Often when a physician is treating an injury vitim, they have to break a few bones first. Java's bones are looking pretty disjointed these days, and if Java is going to move forward, it may be time to break a few bones and reset them.
In the interest of full disclosure, I have to note that I'm just now migrating the code for which I'm responsible to 1.4, from 1.3.1. The only reason I'm making this move is because I'm starting to use third-party packages that claim to require 1.4. The only feature I can think of in 1.4 that comes close to being a "must-have" for me is native regular expressions, and there are packages (like Jakarta-ORO) that provide the same functionality reasonably well.
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